Physics 2
Card Set Information
Author:
misbah
ID:
220482
Filename:
Physics 2
Updated:
2013-05-21 23:45:14
Tags:
thermodynamics magnetism electromagnetic current circuits sound
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Description:
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Thermal expansion
L = original length
T = temperature
Volume expansion for liquids
Internal energy of a system
Work done by the system = positive
Work done on the system = negative
Heat flow into the system = positive
Heat flow out of system = negative
Heat of transformation - phase changes
Q = mL
L = heat of transformation of a system
Work done on the system
P = pressure
constant volume means no work
Energy Spontaneity - entropy
Reversible precess:
L = either heat of fusion or vaporization
Coulomb's law
Magnitude of electrostatic force between two charges
Electric field - produced by an electric charge
q
_{o = }
test charge
F = force felt by test charge
units
: N/C
Electrical potential Energy
Electric potential
volts = J/C
Tesla, gauss
Tesla = Ns/mC
gauss = 10
^{-4 }
tesla
Current
units
: C/s = ampere
Magnetic field at center of current carrying loop
units: tesla
Magnetic Field force
v= velocity
θ= angle between qv and B
Max when θ=90
: qvB
Zero when θ=0
Right hand rule
thumb - velocity
fingers - magnetic field
palm - force
Orbit radius of a charge
set centripatal force equal to magnetic force
qvB=mv
^{2}
/2
Magnetic field of uniform circular motion
velocity of a uniform circular motion
Magnetic force on a current carrying wire
i = current
L = length
Resistance
units: Ω
L = length
A = cross sectional area
Ohm's law
Voltage drop
V = iR
Power of a resistor
P = iV
V = voltage drop across resistor
Power lost during transmission, dissapated by resistor
P = i
^{2}
R
P = V
^{2}
/R
Voltage drop across resistors in series
Current through all resistors is equal to current of total resistance.
Voltage drop across each resistor will be different. - use current to calculate it
Vs are the voltage drop across each resistor
VT is the voltage coming out of the battery.
Total resistance of resistors in series
Voltage drop across resistors in parallel
Voltage drop across each path is the same, but current is split up. More current goes through resistor of least resistance.
Total resistance of resistors in parallel
capacitance
units: farad = c/V
capacitance with two plates
A = area of overlap
d = distance between plates
Electric field in a capacitor
direction of field is away from positive plate.
Potential energy of a capacitor
Dielectrics - change capacitance
C' = kC
C'= new capacitance
C=original capacitance
Electromotive force ε
voltage across terminals of battery when there is no charge flowing